The Effects of Stress and Placebo Alcohol on Cognitive Activation and Inhibitory Control in Male Problem Gamblers and Problem Gamblers with Alcohol Use Disorder
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The Effects of Stress and Placebo Alcohol on Cognitive Activation and Inhibitory Control in Male Problem Gamblers and Problem Gamblers with Alcohol Use Disorder by Lindsay Steinberg A thesis submitted in conformity with the requirements For the degree of Master of Science Graduate Department of Pharmaceutical Sciences University of Toronto © copyright by Lindsay Steinberg (2009) Library and Archives Bibliothèque et Canada Archives Canada Published Heritage Direction du Branch Patrimoine de l’édition 395 Wellington Street 395, rue Wellington Ottawa ON K1A 0N4 Ottawa ON K1A 0N4 Canada Canada Your file Votre référence ISBN: 978-0-494-59601-2 Our file Notre référence ISBN: 978-0-494-59601-2 NOTICE: AVIS: The author has granted a non- L’auteur a accordé une licence non exclusive exclusive license allowing Library and permettant à la Bibliothèque et Archives Archives Canada to reproduce, Canada de reproduire, publier, archiver, publish, archive, preserve, conserve, sauvegarder, conserver, transmettre au public communicate to the public by par télécommunication ou par l’Internet, prêter, telecommunication or on the Internet, distribuer et vendre des thèses partout dans le loan, distribute and sell theses monde, à des fins commerciales ou autres, sur worldwide, for commercial or non- support microforme, papier, électronique et/ou commercial purposes, in microform, autres formats. paper, electronic and/or any other formats. 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The Effects of Stress and Placebo Alcohol on Cognitive Activation and Inhibitory Control in Male Problem Gamblers and Problem Gamblers with Alcohol Use Disorder Degree of Master of Science Graduate Department of Pharmaceutical Sciences University of Toronto Lindsay Steinberg (2009) ABSTRACT This experiment studied relapse by assessing the separate/combined effects of two instigators: alcohol cues and stress on the salience of alcohol/gambling target stimuli and inhibitory control in twelve male problem gamblers and twelve male comorbid drinker- gamblers. Our study day consisted of two test sessions. Subjects received alcohol (non- alcoholic beer) and/or stress (uncontrollable noise) in a counterbalanced method. Hypotheses were tested using computer-based tasks, including the modified Stroop, gambling-word Shift Task, and the conventional and modified Stop-Signal Tasks. Stimuli with incentive value divert attention (i.e., are salient) selectively based on their clinical relevance to the subject and the nature of the instigating factor – stress (expected negative reinforcement) vs. anticipation of alcohol (expected positive reinforcement). Results suggest that alcohol cues and stress have differing effects on incentive salience, and disinhibit behaviour in both pathological populations. These findings have the potential to facilitate treatment and improve understanding for relapse prevention in these subjects ii TABLE OF CONTENTS ABSTRACT……………………………………………………………………………...ii 1. INTRODUCTION ……………………………………………………………………1 1.1 Background and Rationale…………………………………………………….1 a) Problem of Relapse 1.2 Review of the Literature………………………………………………………1 1.2.1 Cognitive Inhibition………………………………………………....1 1.2.1.1 Action Inhibition, Action Restraint & Action Cancellation……………………………………………….3 1.2.1.2 Animal & Human Studies of Inhibition…………………...6 a) Animal Studies b) Human Studies 1.2.2 Neurochemical Basis of Impulsivity………………………………...7 1.2.3 Pathological Gambling……………………………………………..10 1.2.3.1 Definition………………………………………………...10 1.2.3.2 Prevalence………………………………………………..11 1.2.3.3 Pathological Gambling and Impulse Control……………12 1.2.3.4 Neurobiology of Pathological Gambling………………...13 1.2.3.4.1 Neurobiological aspects of impulsivity in PG…13 a) Dopamine b) Norepinephrine c) Serotonin 1.2.3.5 Pathological Gambling and Inhibitory Control…………..16 1.2.4 Alcohol Dependence……………………………………………….18 1.2.4.1 Prevalence………………………………………………..18 1.2.4.2 Alcohol Dependence and Impulse Control………………19 1.2.4.2.1 Response Activation/Inhibition………………..19 1.2.4.2.2 Neurochemistry of acute and chronic alcohol- related disinhibition/impulsivity……………….20 a) Dopamine b) GABA c) Serotonin 1.2.5 Comorbidity of PG and Alcohol Use Disorders………………….. 22 1.2.5.1 Comorbidity and Inhibitory Control……………………. 24 1.2.6 Alcohol Cues……………………………………………………… 25 1.2.6.1 Cue-induced craving in Alcohol Dependence & PG…… 25 1.2.7 Stress……………………………………………………………… 26 1.2.7.1 Animal and Human Studies of Stress Exposure………... 26 a) Animal Studies b) Human Studies 1.3 Restatement of Purpose……………………………………………………... 28 1.4 Hypotheses…………………………………………………………………...28 iii 2. METHODS…………………………………………………………………………...29 2.1 Study Design………………………………………………………………....29 2.2 Recruitment…………………………………………………………………..30 2.3 Screening……………………………………………………………………..30 a) Alcohol Dependence Scale b) South Oaks Gambling Screen c) Beck Depression Inventory 2.4 Subjects………………………………………………………………………31 2.5 Inclusion Criteria…………………………………………………………….32 2.6 Exclusion Criteria……………………………………………………………32 2.7 Apparatus/Materials………………………………………………………….32 2.8 Questionnaires……………………………………………………………….34 2.8.1 State Scales………………………………………………………...34 a) Visual Analog Scale b) Profile of Mood States-short form c) Biphasic Alcohol Effects Scale d) State Anger Scale 2.8.2 Trait Scales........................................................................................35 a) Drinking Motives Questionnaire b) Gambling Motives Questionnaire 2.9 Other Measures……………………………………………………………....36 a) Digit Span b) Drink Strength Rating Scale c) Alcohol Timeline Followback 2.10 Experimental (Computer Based) Tasks…………………………………….37 a) Modified Stroop Task b) Shift Task (Go/No-Go) c) Conventional Stop Signal Task d) Lexical Stop Signal Task 2.11 Stress Manipulation – Noise Task………………………………………….43 2.12 Procedure for Experimental Session………………………………………. 44 2.13 Data Analysis……………………………………………………………… 48 iv 3. RESULTS………………………………………………………………………… 50 3.1 Background Characteristics………………………………………………. 50 3.1.1 Subject Eligibility 3.1.2 Subject Characteristics & Procedural Check 3.1.3 Digit Span Task 3.1.4 Drink Strength Rating Scale 3.2 Experimental Effects……………………………………………………… 54 3.2.1 Self-Report Data………………………………………………… 54 3.2.1.1 M-VAS Desire to Gamble 3.2.1.2 M-VAS Desire for Alcohol 3.2.1.3 State Anger Scale 3.2.2 Cognitive Tasks………………………………………………….. 64 3.2.2.1 Modified Stroop Task 3.2.2.2 Shift Task 3.2.2.3 Lexical Stop Signal Task 3.2.2.4 Conventional Stop Signal Task 3.2.3 Physiological Measures………………………………………….. 79 3.2.3.1 Systolic Blood Pressure 3.2.3.2 Diastolic Blood Pressure 3.2.3.3 Heart Rate 4. DISCUSSION………………………………………………………………………. 87 4.1 Self-Report………………………………………………………………….. 88 4.1.1 Desire to Gamble 4.1.2 Desire for Alcohol 4.1.3 State Anger Scale 4.2 Cognitive Tasks……………………………………………………………...91 4.2.1 Modified Stroop Task 4.2.2 Conventional Stop Signal Task 4.2.3 Lexical Stop Signal Task 4.2.4 Shift Task 4.3 Physiological Measures…………………………………………………….. 97 4.4 General Discussion…………………………………………………………..98 4.5 Conclusions…………………………………………………………………103 4.6 Limitations………………………………………………………………….104 4.7 Future Directions…………………………………………………………...104 v 5. REFERENCES…………………………………………………………………….. 105 6. APPENDICES………………………………………………………………………117 5.1 APPENDIX A Study Advertisement from February 2008 to February 2009…………..117 5.2 APPENDIX B Consent Form…………………………………………………………...118 5.3 APPENDIX C Table 1. ANOVA of colour-naming reaction times on the modified Stroop task………………………………………….123 Table 2. ANOVA of commission errors on the Shift Task…………….124 Table 3. ANOVA of reaction time scores on the Lexical Stop Signal Task…………………………………………………………...126 Table 4. ANOVA of reaction time scores on the Conventional Stop Signal Task……………………………………………………127 vi LIST OF TABLES 1. Criteria for Pathological Gambling across versions of the DSM………………..11 2. DSM-IV Criteria for Alcohol Dependence………………………………………19 3. Stress-Drink sequences for problem gamblers (PG; n=12) and problem gamblers with alcohol use disorder (PGAD; n=12)……………………………...30 4. Test Session Timeline……………………………………………………………46 5. MANOVA of background characteristics in problem gamblers (PG; n=12) and problem gamblers with alcohol use disorder (PGAD; n=12)……………….51 6. Mean (SD) background characteristics in problem gamblers (PG; n=12) and problem gamblers with alcohol use disorder (PGAD; n=12) (n=12)………..52 7. Mean (SD) scores for problem gamblers (PG; n=12) and problem gamblers with alcohol use disorder (PGAD; n=12) on the Digit Span Task………………53 8. Mean (SD) Drink Strength ratings for problem gamblers (PG; n=12) and problem gamblers with alcohol use disorder (PGAD; n=12) of placebo beer drinks……………………………………………………………………………. 54 9. Mean (SD) SSRT for the Conventional